Spring structure for cushion seating

Abstract

An adjustable coil seat is provided which utilizes the combination of a plurality of parallel rows of sinuous springs which are connected at opposite ends of the frame, at least one row of tapered conical coil springs in transverse relation to the sinuous springs and positioned in supporting relationship under the sinuous springs at a location between the ends of the sinuous springs, and a rigid cross-support beam structure which supports the bottom end of the tapered coiled springs. The cross support structure may be of adjustable height to vary pretension of the spring mechanism.

What is claimed is: 
     
       1. A spring cushion construction comprising: (a) a frame for supporting the construction, the frame comprising a front rail, a rear rail and two opposing side rails;   (b) at least one rigid support member extending between and generally parallel to the front and rear rails within the frame, the support member having two ends, each being attached to the opposing side rails;   (c) a plurality of parallel sinuous wire springs traversing the frame between the front and rear rails in a direction generally perpendicular to the support member;   (d) a plurality of coil springs fixedly mounted at their respective lower ends to said support member and said coil springs spaced along the area of said spring cushion between said front and rear rails and intended to support the load of a seated person's weight, wherein each coil spring is attached at its upper end to at least one sinuous spring, said coil springs being held relatively fixed at their lower ends on said rigid support member during compression of said coil springs under said load for effective absorption of said load on the spring system including said coil and sinuous wire springs to provide deep resilient support to the sinuous springs and   (e) a tie wire located substantially parallel to the support member and generally overlying each of said coil springs generally in the central portion thereof, the tie wire being connected to the sinuous and coil springs.   
     
     
       2. The spring cushion construction according to claim 1 further comprising at least one slat having two ends, each end being fixedly attached to the front rail and the rear rail respectively. 
     
     
       3. The spring cushion construction according to claim 2 in which the support member is a unitary piece being partially supported by the at least one slat. 
     
     
       4. The spring cushion construction according to claim 2 in which the support member is sectioned wherein the ends of each section join at the slat. 
     
     
       5. The spring cushion construction according to claim 1 wherein the coil springs define end coil springs located between the support members and the sinuous springs, the end coil springs being connected to two sinuous springs. 
     
     
       6. The spring cushion construction according to claim 1 wherein the coil springs are conical in shape. 
     
     
       7. The spring cushion construction according to claim 1 wherein the coil springs are composed of wire having the dimensions of between 8-gauge and 14-gauge in diameter. 
     
     
       8. The spring cushion construction according to claim 5 further comprising a tie wire located substantially parallel to the support member, the tie wire being connected to the sinuous and coil springs. 
     
     
       9. The spring cushion construction according to claim 8 in which the tie wire extends through the center of the top surface of each coil spring except for the end coil springs in which the tie wire loops round the upper surface of the end coil spring. 
     
     
       10. The spring cushion construction according to claim 1 further comprising means to adjust the resilience of the plurality of coil springs by varying the position of said rigid support member relative to said sinuous wire springs. 
     
     
       11. The spring cushion construction according to claim 10 wherein the means to adjust the resilience of the plurality of coil springs comprises end mount adjusters fixedly attached to the two opposing side rails, wherein the end mount adjusters adjustably position the ends of the support member to each of the opposing rails. 
     
     
       12. The spring cushion construction according to claim 11 further comprising at least one slat having two ends, each end being fixedly attached to the front rail and the rear rail respectively, wherein the support member is a unitary piece being partially supported by at least one slat, the spring cushion further comprising a center amount adjuster positioned at the intersection between the at least one support member and the slat, wherein the center mount adjuster adjusts the height of the at least one support member with respect to the slat. 
     
     
       13. A spring cushion construction comprising: (a) a frame for supporting the construction, the frame comprising a front rail, a rear rail and two opposing side rails;   (b) at least one rigid support member between and generally parallel to the front and rear rails within the frame, the support member having two ends, each being attached to the opposing side rails;   (c) a plurality of parallel sinuous wire springs traversing the frame between the front and rear rails in a manner generally perpendicular to the support member;   (d) a plurality of coil springs fixedly mounted on each support member and spaced along the area of said spring cushion between said front and rear rails and intended to support the load of a seated person's weight, the coil springs defining end coil springs, located between the support member and the sinuous springs, each coil spring being attached to at least one sinuous spring;   (e) means to adjust the resilience of the plurality of the coil springs by varying the position of said rigid support member relative to the sinuous wire springs; and   (f) a tie wire located substantially parallel to the support member and generally overlying each of said coil springs generally in the central portion thereof, the tie wire being connected to the sinuous and coil springs.   
     
     
       14. The spring cushion construction according to claim 13 wherein the means to adjust the resilience of the plurality of coil springs comprises end mount adjusters fixedly attached to the two opposing side rails, wherein the end mount adjusters adjustably position the ends of the support member to each of the opposing rails. 
     
     
       15. The spring cushion construction according to claim 14 further comprising at least one slat having two ends, each end being fixedly attached to the front rail and the rear rail respectively, wherein the support member is partially supported by the slat, the spring cushion further comprising a center mount adjuster positioned at the intersection between the support member and the slat, wherein the center mount adjuster adjusts the height of the support member with respect to the slat. 
     
     
       16. The spring cushion construction according to claim 13 wherein said coil springs are spaced along the area of said spring cushion intended to resist the load of a seated person's weight. 
     
     
       17. The spring cushion construction according to claim 16 wherein the attachment of said coil springs to said sinuous springs is at the upper ends of said coil springs and wherein said coil springs are fixedly mounted at their respective lower ends to said support member with said coil springs being held relatively fixed at their lower ends during compression of said coil springs under said load for effective compression absorption of said seating loads on said springs. 
     
     
       18. A spring cushion construction comprising: (a) a frame for supporting the construction, the frame comprising a front rail, a rear rail and two opposing side rails,   (b) at least one rigid support member extending between and generally parallel to the front and rear rails within the frame, the support member having two ends, each being attached to the opposing side rails;   (c) at least one slat having two ends, each end being fixedly attached to the front rail and the rear rail respectively;   (d) a plurality of parallel sinuous wire springs traversing the frame between the front and rear rails in a direction generally perpendicular to the support member;   (e) a plurality of coil springs fixedly mounted at their respective lower ends to said support member and said coil springs spaced along the area of said spring cushion between said front and rear rails and intended to support the load of a seated person's weight, wherein each coil spring is attached at its upper end to at least one sinuous spring, said coil springs being held relatively fixed at their lower ends on said rigid support member during compression of said coil springs under said load for effective absorption of said load on the spring system including said coil and sinuous wire springs to provide deep resilient support to the sinuous springs; and   (f) one of said sinuous springs positioned substantially directly above said slat with no coil spring extending between said slat and said one sinuous spring.